Question 1

Two technicians are discussing the towing of a four-wheel-drive vehicle. Technician A says that the vehicle should be transported on a flatbed truck to avoid the possibility of doing damage to the drive train. Technician B says that the wheels not lifted off the ground by the tow truck should be placed on a dolly to prevent doing damage to the drive train. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B C

Question 2

A transfer case contains all of the following components, EXCEPT ________.

Accepted Answer

A)  Shift mechanism
B)  Four drive sprockets
C)  Front output shaft
D)  Planetary gearset assembly B

Question 3

The planetary gearsets used in transfer cases consist of all of the following components EXCEPT ________.

Accepted Answer

A)  Planet carrier assembly
B)  Internal ring gear
C)  Forward clutch
D)  Sun gear C

Question 4

Technician A says that a vehicle equipped with part-time four-wheel drive should be driven in four-wheel drive only on slippery surfaces. Technician B says that full-time four-wheel-drive vehicles use a center differential in the transfer case. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 5

A transfer case is difficult to shift (range shift). Technician A says that the shift linkage or shift fork may be worn or damaged. Technician B says that the blocking ring may be worn or damaged. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 6

Two technicians are discussing the purpose of a transfer case in a four-wheel-drive system. Technician A says it transfers power to an additional axle. Technician B says some transfer cases have two speeds. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 7

Two technicians are discussing the viscous coupling used in all-wheel drive systems. Technician A says a viscous fluid such as a silicon-based oil is added to the assembly and fills the areas between the clutch plates. Technician B says the viscous coupling is active during equal traction conditions. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 8

A customer complained of excessive vibration while cornering and accelerating at the same time. Technician A says that a fault in the transfer case is the most likely cause. Technician B says that the vibration may be normal if the vehicle is equipped with Cardan U-joints at the front wheels. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 9

Two technicians are discussing the front axle disconnect mechanism. Technician A says that the front axles are only disconnected if the vehicle is being towed. Technician B says that this unit is only used on
All-wheel-drive vehicles. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 10

Technician A says some 4WD vehicles use a solid front axle. Technician B says some 4WD vehicles use halfshafts to send torque to the front wheels. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 11

Technician A says some front 4WD hubs must be manually locked and unlocked. Technician B says some front 4WD hubs can be automatically locked and unlocked. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 12

Technician A says that most transfer cases have a built in oil pump. Technician B says that most transfer cases use a heavy grease as a lubricant. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 13

What 4 wheel drive system is shown in this drawing of a front axle?

Accepted Answer

A)  Rear axle disconnect system
B)  Axle disconnect mechanism
C)  Not enough information
D)  Planetary gear set

Question 14

Technician A says a 4WD transfer case is an auxiliary 2-speed transmission. Technician B says a planetary gearset provides a low and high range. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 15

Driveline wind-up on a part-time 4WD system results in all of the listed conditions EXCEPT ________.

Accepted Answer

A)  Low traction situations from heavy rain, mud, or snow
B)  No differential action between the front and rear axles
C)  The front wheels tend to scoot along the pavement causing a driveline vibration
D)  The turning radius is different for the left and right wheels as well as the front and rear wheels

Question 16

Technician A says that the gear ratios of both differentials are the same in a four-wheel-drive vehicle.Technician B says that the rear differential has a slightly higher ratio (lower number) than the front differential. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 17

When part-time 4WD vehicles in 4WD are engaged in a turn, which of these occur?

Accepted Answer

A)  The front wheels will have reduced toe-out on turns
B)  The rear wheels travel faster and farther than the front wheels
C)  The rear wheels turn faster and farther than the front wheels
D)  The front wheels travel faster and farther than the rear wheels

Question 18

Which component is used in some transfer cases to prevent driveline windup?

Accepted Answer

A)  Planetary gear differential
B)  Viscous coupling
C)  Standard bevel gear differential
D)  Any of these can be used to prevent driveline windup

Question 19

Technician A says that a transfer case may use GL-4 gear lube such as SAE 80W-90. Technician B says that a transfer case may use automatic transmission fluid (ATF) such as Dexron III. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 20

Technician A says full time 4WD also allows the driver to select 2WD or 4WD. Technician B says part-time 4WD includes a differential or viscous coupling that allows the front and rear axles to rotate at different speeds. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Exam 126: Four-Wheel-Drive and All-Wheel Drive

A transfer case contains all of the following components, EXCEPT ________.

The planetary gearsets used in transfer cases consist of all of the following components EXCEPT ________.

Technician A says that a vehicle equipped with part-time four-wheel drive should be driven in four-wheel drive only on slippery surfaces. Technician B says that full-time four-wheel-drive vehicles use a center differential in the transfer case. Which technician is correct?

A transfer case is difficult to shift (range shift) . Technician A says that the shift linkage or shift fork may be worn or damaged. Technician B says that the blocking ring may be worn or damaged. Which technician is correct?

Two technicians are discussing the purpose of a transfer case in a four-wheel-drive system. Technician A says it transfers power to an additional axle. Technician B says some transfer cases have two speeds. Which technician is correct?

Two technicians are discussing the front axle disconnect mechanism. Technician A says that the front axles are only disconnected if the vehicle is being towed. Technician B says that this unit is only used on All-wheel-drive vehicles. Which technician is correct?

Technician A says some 4WD vehicles use a solid front axle. Technician B says some 4WD vehicles use halfshafts to send torque to the front wheels. Which technician is correct?

Technician A says some front 4WD hubs must be manually locked and unlocked. Technician B says some front 4WD hubs can be automatically locked and unlocked. Which technician is correct?

Technician A says that most transfer cases have a built in oil pump. Technician B says that most transfer cases use a heavy grease as a lubricant. Which technician is correct?

What 4 wheel drive system is shown in this drawing of a front axle?

Technician A says a 4WD transfer case is an auxiliary 2-speed transmission. Technician B says a planetary gearset provides a low and high range. Which technician is correct?

Driveline wind-up on a part-time 4WD system results in all of the listed conditions EXCEPT ________.

Technician A says that the gear ratios of both differentials are the same in a four-wheel-drive vehicle.Technician B says that the rear differential has a slightly higher ratio (lower number) than the front differential. Which technician is correct?

When part-time 4WD vehicles in 4WD are engaged in a turn, which of these occur?

Which component is used in some transfer cases to prevent driveline windup?

Technician A says that a transfer case may use GL-4 gear lube such as SAE 80W-90. Technician B says that a transfer case may use automatic transmission fluid (ATF) such as Dexron III. Which technician is correct?

Technician A says full time 4WD also allows the driver to select 2WD or 4WD. Technician B says part-time 4WD includes a differential or viscous coupling that allows the front and rear axles to rotate at different speeds. Which technician is correct?